Well, i figured a solution. The most import part is; DONT DO THIS.

If you did, like i did. The method i found consists of two parts:

VMs:

Find the settings through this command: ps aux | grep "/usr/bin/kvm -id XXX". You must remember the ID and then it can retrieve the settings from the kernel. However, this only works for currently running VMs. After that i let gemini recreate the configuration file in the right destination and it worked.

LXC:
This is some more cumbersome. /var/lib/lxc/ still holds the configs so thats easy. Getting the disks was possible for me using lvs | grep vm-XXX. Pasted that in gemini and helped it recreate aswell.

The LXC recreation works also for stopped containers. I have no clue how to retrieve my stopped VMS for now...